> I suspected it's the North Ronaldsay sheep dyke - it was classed as an "A" > listed monument in March 2000. Excellent! I looked that up on CANMORE and it also led me to Treb Dyke, also in North Ronaldsay, which was scheduled the same year. A busy year for North Ronaldsay walls. Thanks Sigurd! Martin -- Martin McCarthy /</ http://www.non-prophet.org marty@ancient-scotland.co.uk \>\ http://www.ancient-scotland.co.uk /</ http://www.ehabitat.demon.co.uk